Attachment for operating telephone call-bells



(No Model.) 2 Sheets-Sheet 1.

H. W. LIBBEY. ATTACHMENT FOR OPERATING TELEPHONE CALL BELLS.

No. 580,335. Patented Apr. 6, 1897 2 Sh eetsSheet 2.

(No Model.)

H. W. LIBBEY.

ATTACHMENT FOR OPERATING TELEPHONE GALL BELLS.

Patented Apr, 6,1897.

UNITED STATES PATENT union.

HOSEA IV. IJIBBEY, OF BOSTON, llIASSAOHUSETTS.

ATTACHMENT FOR OPERATING TELEPHQNEQALL-BELLS.

SPECIFICATION forming part of Letters Patent No. 580,335, dated April 6, 1897.

Application filed September 19, 1893. Renewed February 25 1897. Serial No. 625,041. (No model.)

To aZZ whom it may concern:

Be it known that I, IIOSEA "W. LIBBEY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Attachments for Operating Telephone Call-Bells, of which the following, taken in connection with the accompanying drawings, is a specification.

In telephones when it is desired to signal by ringing the call-bell the switch-button has to be depressed with one hand and the crank of the magneto-machine has to be turned several times with the other hand.

Now the object of my invention is to operate the switch-button and the magneto-machine so as to cause the bell to ring by simply pulling upon a cord with one hand, which when released resumes its normal position ready for the operation to be repeated.

The invention consists of a hollow spool mounted upon a stud on a line with the shaft that has to be rotated to operate the magnetomachine, said spool inelosing a helical spring, one end of which is attached to the stud and the other end to the spool, a cord wound upon said spool, a ratchet-wheel secured upon the shaft, and a pawl upon the side of the spool, so that when the cord is drawn upon the spool will be rotated, and with it the shaft, by means of the pawl and ratchetwheel.

The invention also consists of a lever for depressing the switch-button, said lever being operated by the cord passing through a beveled hole in a block on the end of the lever and so that when the cord is released it releases the lever and will again be wound upon the spool by the helical spring, the pawl riding over the teeth of the ratchet-wheel, so as not to operate the shaft.

Referring to the accompanying drawings, Figure 1 represents a portion of a telephone transmitting instrument with an attachment embodying my invention for operating the magneto-machine applied thereto. Fig. 2 is a side View of same. Fig. 3 is a section taken on line a: a: of Fig. 1. Fig. 4 is a section taken on line as of Fig. 1. Fig. 5 is a section taken on line y y of Fig. 1, and Fig. 6 is a detail. Fig. 7 shows a telephone and connections with my improvements applied thereto.

A represents a portion of the casing of a transmittinginstrument; B, the shaft of the magneto-machine upon which the crank is usually placed. To apply my invention, the crank is removed and a ratchet-wheel C is secured upon the shaft near the side of the case.

D is a cap secured to the side of the casing A. This cap carries a fixed stud E, having a collar 6, that [its against the inner side of the cap, and a screw-threaded portion 6 passes through said cap and is secured by a nut F. The inner end of the stud E, as shown, is pointed and has a bearing in a conical recess formed in the end of the shaft B. Upon the stud E is loosely mounted a hollow spool G, on one side of which is secured a pawl II, that takes into the teeth of the ratchet-wheel O, and within this hollow spool G is arranged a helical spring I, one end of which is secured to the stud E and the other end to the inner side of thespool G.

To the outside of the spoolG is secured one end of a cord J, that is wound around the spool G as many times as maybe desired, and the end of said cord is passed through a beveled hole 7c, formed in a block K, secured to the end of a lever L, fulcrumed at Z, the in ner end of which lever operates the push-button M to form the electrical connection. IVhen in its normal position, the cord J is wound around the spool G and the spring I is unwound, and the end of the cord passes through the beveled hole 7; in the block K. Now by drawing upon the cord J it istightened and hugs the block K by reason of its passing through beveled hole 7; and draws down the said block K, and with it the outer end of the lever L, thus causing the inner end of the lever to press upon and operate the push-button M,.thus completing the electric circuit, and by continuing to pull upon the cord the spool G is rotated, and with it the shaft B, through the pawl II and ratchetwheel 0, thus causing the bell to ring. As soon as the cord is released the spring I will unwind, and thus rotating the spool in the opposite direction wind the cord thereon ready to be again drawn down.

Referring to Fig. 7, the operation is as follows: The operator pulls the cord J, which causes the spool G to rot-ate, thereby imparting a rotary motion to the armature N, thus inducing a current. At the same time the cord, passing through the eye 70, operates the lever L and depresses the button M, throwing the spring P in. contact with the point p, producing a circuit through the bell-magnets Q, setting in motion the hammer 1%, which taps the bells S, at the same time sounding the bells at the other end of the line. Upon releasing the cord J and removing the telephone from its support the bell-circuit is cut off and the line-circuit opened through the switch Y in the usual manner. T is the telephone, U the switch, and V the ligl1tingarrester.

What I claim is 1. In combination with the bell-operating shaft of a telephone, a lever secured to the casing of the instrument one end of said lever being over the push-button, and the other end having a block with a beveled hole through it, a cord passing through said block, and wound around a spool adapted to rotate the bell-shaft when the cord is pulled out, as set forth.

2. In combination with the bell-operating shaft B, a ratchet-wheel 0, cap D, stud E, spool G, spring I, pawl II, and cord J, lever L, carrying-block K, having a beveled hole through which the cord passes, all arranged and operated as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 28th day of April, A. D 1899.

IIOSEA \V. LIIBBEY.

Witnesses:

CHAS. STEERE, EDWIN PLANTA. 

